科研之友
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摘要
Recently a lot of progress has been made towards a full classification of new physics effects in Higgs observables by means of effective dimension-six operators. Specifically, Higgs production in association with a high transverse momentum jet has been suggested as a way to discriminate between operators that modify the Higgs-top coupling (O-t) and operators that induce an effective Higgs-gluon coupling (O-g)-a distinction that is hard to achieve with signal strength measurements alone. With this article we would like to draw attention to another source of new physics in Higgs + jet observables: the triple gluon operator O-3g (consisting of three factors of the gluon field strength tensor). We compute the distortions of kinematic distributions in Higgs + jet production at a 14 TeV LHC due to O-3g and compare them with the distortions due to Ot and Og. We find that the transverse momentum distributions alone cannot discriminate between O-3g and O-g if the coefficient of the operator Ot treated as an unknown parameter. We further show that the jet rapidity and the difference between the Higgs and jet rapidity are well suited to remove this new degeneracy. Using rough estimates for the expected bounds we find that allowed distortions in kinematic distributions due to Og are of similar size as those due to O-3g. We conclude that a full analysis of new physics in Higgs + jet observables must take the contributions from O-3g into account.
- 出版日期2015-2-25
